basic structure

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) <year> <copyright holders>
+Copyright (c) 2023 William Perron
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 

config.go

@@ -0,0 +1,38 @@
+package sqliteexporter
+
+import (
+	"errors"
+
+	"go.opentelemetry.io/collector/component"
+	"go.opentelemetry.io/collector/confmap"
+)
+
+var _ component.Config = (*Config)(nil)
+
+type Config struct {
+	// Path of the sqlite3 database file. Path is relative to current directory.
+	// If file does not exist, it will be created by the exporter.
+	Path string `mapstructure:"path"`
+
+	// TODO(wperron) add options for WAL/journal mode, etc.
+}
+
+func (cfg *Config) Validate() error {
+	if cfg.Path == "" {
+		return errors.New("path must be non-empty")
+	}
+
+	return nil
+}
+
+func (cfg *Config) Unmarshal(componentParser *confmap.Conf) error {
+	if componentParser == nil {
+		return errors.New("empty config for sqlite exporter")
+	}
+
+	if err := componentParser.Unmarshal(cfg, confmap.WithErrorUnused()); err != nil {
+		return err
+	}
+
+	return nil
+}

config_test.go

@@ -0,0 +1,57 @@
+package sqliteexporter
+
+import (
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"go.wperron.io/sqliteexporter/internal/metadata"
+
+	"go.opentelemetry.io/collector/component"
+	"go.opentelemetry.io/collector/confmap/confmaptest"
+)
+
+func TestLoadConfig(t *testing.T) {
+	t.Parallel()
+
+	cm, err := confmaptest.LoadConf(filepath.Join("testdata", "config.yaml"))
+	require.NoError(t, err)
+
+	tests := []struct {
+		id           component.ID
+		expected     component.Config
+		errorMessage string
+	}{
+		{
+			id: component.NewIDWithName(metadata.Type, "1"),
+			expected: &Config{
+				Path: "./traces.db",
+			},
+			errorMessage: "",
+		},
+		{
+			id:           component.NewIDWithName(metadata.Type, "2"),
+			expected:     nil,
+			errorMessage: "path must be non-empty",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.id.String(), func(t *testing.T) {
+			factory := NewFactory()
+			cfg := factory.CreateDefaultConfig()
+
+			sub, err := cm.Sub(tt.id.String())
+			require.NoError(t, err)
+			require.NoError(t, component.UnmarshalConfig(sub, cfg))
+
+			if tt.expected == nil {
+				assert.EqualError(t, component.ValidateConfig(cfg), tt.errorMessage)
+				return
+			}
+
+			assert.NoError(t, component.ValidateConfig(cfg))
+			assert.Equal(t, tt.expected, cfg)
+		})
+	}
+}

factory.go

@@ -0,0 +1,47 @@
+package sqliteexporter
+
+import (
+	"context"
+
+	"go.opentelemetry.io/collector/component"
+	"go.opentelemetry.io/collector/consumer"
+	"go.opentelemetry.io/collector/exporter"
+	"go.opentelemetry.io/collector/exporter/exporterhelper"
+	"go.wperron.io/sqliteexporter/internal/metadata"
+)
+
+func NewFactory() exporter.Factory {
+	return exporter.NewFactory(
+		metadata.Type,
+		createDefaultConfig,
+		exporter.WithTraces(createTracesExporter, metadata.TracesStability),
+		exporter.WithMetrics(nil, metadata.MetricsStability),
+		exporter.WithLogs(nil, metadata.LogsStability),
+	)
+}
+
+func createDefaultConfig() component.Config {
+	return &Config{}
+}
+
+func createTracesExporter(
+	ctx context.Context,
+	set exporter.CreateSettings,
+	cfg component.Config,
+) (exporter.Traces, error) {
+	conf := cfg.(*Config)
+
+	se := newSqliteExporter(conf)
+
+	return exporterhelper.NewTracesExporter(
+		ctx, set, cfg,
+		se.ConsumeTraces,
+		exporterhelper.WithStart(se.Start),
+		exporterhelper.WithShutdown(se.Shutdown),
+		exporterhelper.WithCapabilities(consumer.Capabilities{MutatesData: false}),
+	)
+}
+
+func newSqliteExporter(cfg *Config) *sqliteExporter {
+	return &sqliteExporter{}
+}

factory_test.go

@@ -0,0 +1,31 @@
+package sqliteexporter
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"go.opentelemetry.io/collector/component/componenttest"
+	"go.opentelemetry.io/collector/exporter/exportertest"
+)
+
+func TestCreateDefaultConfig(t *testing.T) {
+	cfg := createDefaultConfig()
+	assert.NotNil(t, cfg, "failed to create default config")
+	assert.NoError(t, componenttest.CheckConfigStruct(cfg))
+}
+
+func Test_createTracesExporter(t *testing.T) {
+	cfg := &Config{
+		Path: "./traces.db",
+	}
+
+	exp, err := createTracesExporter(
+		context.Background(),
+		exportertest.NewNopCreateSettings(),
+		cfg,
+	)
+	assert.NoError(t, err)
+	require.NotNil(t, exp)
+}

go.mod

@@ -1,3 +1,51 @@
 module go.wperron.io/sqliteexporter
 
 go 1.20
+
+require go.opentelemetry.io/collector/component v0.84.0
+
+require (
+	github.com/cenkalti/backoff/v4 v4.2.1 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	go.opencensus.io v0.24.0 // indirect
+	go.opentelemetry.io/collector/consumer v0.84.0 // indirect
+	go.opentelemetry.io/collector/extension v0.84.0 // indirect
+	go.opentelemetry.io/collector/processor v0.84.0 // indirect
+	go.opentelemetry.io/collector/receiver v0.84.0 // indirect
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/knadh/koanf/maps v0.1.1 // indirect
+	github.com/knadh/koanf/providers/confmap v0.1.0 // indirect
+	github.com/knadh/koanf/v2 v2.0.1 // indirect
+	github.com/mitchellh/copystructure v1.2.0 // indirect
+	github.com/mitchellh/mapstructure v1.5.1-0.20220423185008-bf980b35cac4 // indirect
+	github.com/mitchellh/reflectwalk v1.0.2 // indirect
+	github.com/open-telemetry/opentelemetry-collector-contrib/internal/sharedcomponent v0.84.0
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/stretchr/objx v0.5.0 // indirect
+	github.com/stretchr/testify v1.8.4 // indirect
+	go.opentelemetry.io/collector v0.84.0 // indirect
+	go.opentelemetry.io/collector/config/configtelemetry v0.84.0 // indirect
+	go.opentelemetry.io/collector/confmap v0.84.0 // indirect
+	go.opentelemetry.io/collector/exporter v0.84.0
+	go.opentelemetry.io/collector/featuregate v1.0.0-rcv0014 // indirect
+	go.opentelemetry.io/collector/pdata v1.0.0-rcv0014 // indirect
+	go.opentelemetry.io/otel v1.16.0 // indirect
+	go.opentelemetry.io/otel/metric v1.16.0 // indirect
+	go.opentelemetry.io/otel/trace v1.16.0 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
+	go.uber.org/zap v1.25.0 // indirect
+	golang.org/x/net v0.14.0 // indirect
+	golang.org/x/sys v0.11.0 // indirect
+	golang.org/x/text v0.12.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20230530153820-e85fd2cbaebc // indirect
+	google.golang.org/grpc v1.57.0 // indirect
+	google.golang.org/protobuf v1.31.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

go.sum

@@ -0,0 +1,196 @@
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internal/metadata/status.go

@@ -0,0 +1,14 @@
+// TODO(wperron) this file is normally auto-generated, set up that process.
+
+package metadata
+
+import (
+	"go.opentelemetry.io/collector/component"
+)
+
+const (
+	Type             = "sqlite"
+	TracesStability  = component.StabilityLevelAlpha
+	MetricsStability = component.StabilityLevelUndefined
+	LogsStability    = component.StabilityLevelUndefined
+)

sqlite_exporter.go

@@ -0,0 +1,49 @@
+package sqliteexporter
+
+import (
+	"context"
+
+	"go.opentelemetry.io/collector/component"
+	"go.opentelemetry.io/collector/pdata/ptrace"
+)
+
+type sqliteExporter struct{}
+
+// Start tells the component to start. Host parameter can be used for communicating
+// with the host after Start() has already returned. If an error is returned by
+// Start() then the collector startup will be aborted.
+// If this is an exporter component it may prepare for exporting
+// by connecting to the endpoint.
+//
+// If the component needs to perform a long-running starting operation then it is recommended
+// that Start() returns quickly and the long-running operation is performed in background.
+// In that case make sure that the long-running operation does not use the context passed
+// to Start() function since that context will be cancelled soon and can abort the long-running
+// operation. Create a new context from the context.Background() for long-running operations.
+func (e *sqliteExporter) Start(ctx context.Context, host component.Host) error {
+	panic("not implemented") // TODO: Implement
+}
+
+// Shutdown is invoked during service shutdown. After Shutdown() is called, if the component
+// accepted data in any way, it should not accept it anymore.
+//
+// This method must be safe to call:
+//   - without Start() having been called
+//   - if the component is in a shutdown state already
+//
+// If there are any background operations running by the component they must be aborted before
+// this function returns. Remember that if you started any long-running background operations from
+// the Start() method, those operations must be also cancelled. If there are any buffers in the
+// component, they should be cleared and the data sent immediately to the next component.
+//
+// The component's lifecycle is completed once the Shutdown() method returns. No other
+// methods of the component are called after that. If necessary a new component with
+// the same or different configuration may be created and started (this may happen
+// for example if we want to restart the component).
+func (e *sqliteExporter) Shutdown(ctx context.Context) error {
+	panic("not implemented") // TODO: Implement
+}
+
+func (e *sqliteExporter) ConsumeTraces(ctx context.Context, traces ptrace.Traces) error {
+	panic("not implemented")
+}

testdata/config.yaml

@@ -0,0 +1,3 @@
+sqlite/1:
+  path: "./traces.db"
+sqlite/2: